How to slice a tensor using given indices in tensorflow?











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I have a tensor with probabilities. This is a dynamic tensor with shape (?, 30) and I am selecting index with the best probability of these 30 values as :



    best_probability = tf.argmax(probability, axis = 1)


Now the dimensions of tensor best_probability is (?,). Now I want to select the values with these indices from another tensor called data with dimensions (?, 30, 1024, 3). Essentially from each of the 30 values select one with best probability using best_probability tensor.



The final output should have dimensions of (?, 1024, 3).



PS:- I tried gather_nd but it need indexing of best_probability tensor something like [[0, 9], [1, 10], [2, 15], [3, 25]]. To do so I wrote following snippet.



 selected_data = tf.stack(tf.range(probability.shape[0]),
tf.argmax(probability, axis = 1))


This doesn't work as I am dealing with a dynamic tensor. Is there any alternative to solve this problem.










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    up vote
    0
    down vote

    favorite












    I have a tensor with probabilities. This is a dynamic tensor with shape (?, 30) and I am selecting index with the best probability of these 30 values as :



        best_probability = tf.argmax(probability, axis = 1)


    Now the dimensions of tensor best_probability is (?,). Now I want to select the values with these indices from another tensor called data with dimensions (?, 30, 1024, 3). Essentially from each of the 30 values select one with best probability using best_probability tensor.



    The final output should have dimensions of (?, 1024, 3).



    PS:- I tried gather_nd but it need indexing of best_probability tensor something like [[0, 9], [1, 10], [2, 15], [3, 25]]. To do so I wrote following snippet.



     selected_data = tf.stack(tf.range(probability.shape[0]),
    tf.argmax(probability, axis = 1))


    This doesn't work as I am dealing with a dynamic tensor. Is there any alternative to solve this problem.










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a tensor with probabilities. This is a dynamic tensor with shape (?, 30) and I am selecting index with the best probability of these 30 values as :



          best_probability = tf.argmax(probability, axis = 1)


      Now the dimensions of tensor best_probability is (?,). Now I want to select the values with these indices from another tensor called data with dimensions (?, 30, 1024, 3). Essentially from each of the 30 values select one with best probability using best_probability tensor.



      The final output should have dimensions of (?, 1024, 3).



      PS:- I tried gather_nd but it need indexing of best_probability tensor something like [[0, 9], [1, 10], [2, 15], [3, 25]]. To do so I wrote following snippet.



       selected_data = tf.stack(tf.range(probability.shape[0]),
      tf.argmax(probability, axis = 1))


      This doesn't work as I am dealing with a dynamic tensor. Is there any alternative to solve this problem.










      share|improve this question













      I have a tensor with probabilities. This is a dynamic tensor with shape (?, 30) and I am selecting index with the best probability of these 30 values as :



          best_probability = tf.argmax(probability, axis = 1)


      Now the dimensions of tensor best_probability is (?,). Now I want to select the values with these indices from another tensor called data with dimensions (?, 30, 1024, 3). Essentially from each of the 30 values select one with best probability using best_probability tensor.



      The final output should have dimensions of (?, 1024, 3).



      PS:- I tried gather_nd but it need indexing of best_probability tensor something like [[0, 9], [1, 10], [2, 15], [3, 25]]. To do so I wrote following snippet.



       selected_data = tf.stack(tf.range(probability.shape[0]),
      tf.argmax(probability, axis = 1))


      This doesn't work as I am dealing with a dynamic tensor. Is there any alternative to solve this problem.







      tensorflow slice






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      asked Nov 10 at 13:17









      Saurabh Pradhan

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          I was able to solve this issue using tf.batch_gather and tf.reshape



          selected_data = tf.reshape(tf.batch_gather(data, best_probability),
          (-1, data.shape[2],data.shape[3]))





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            1 Answer
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            1 Answer
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            up vote
            0
            down vote













            I was able to solve this issue using tf.batch_gather and tf.reshape



            selected_data = tf.reshape(tf.batch_gather(data, best_probability),
            (-1, data.shape[2],data.shape[3]))





            share|improve this answer

























              up vote
              0
              down vote













              I was able to solve this issue using tf.batch_gather and tf.reshape



              selected_data = tf.reshape(tf.batch_gather(data, best_probability),
              (-1, data.shape[2],data.shape[3]))





              share|improve this answer























                up vote
                0
                down vote










                up vote
                0
                down vote









                I was able to solve this issue using tf.batch_gather and tf.reshape



                selected_data = tf.reshape(tf.batch_gather(data, best_probability),
                (-1, data.shape[2],data.shape[3]))





                share|improve this answer












                I was able to solve this issue using tf.batch_gather and tf.reshape



                selected_data = tf.reshape(tf.batch_gather(data, best_probability),
                (-1, data.shape[2],data.shape[3]))






                share|improve this answer












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                share|improve this answer










                answered Nov 10 at 14:24









                Saurabh Pradhan

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